Blade drift, end of board

[TBrown99]

What would cause board ends to exhibit blade drift, as shown in this run of black cherry boards?

I've been conscious to ensure that everything on my LT-35H is aligned and set properly... fresh blade, blade tension, drive belt deflection, blade tilt, etc. The only item I'm aware of is the drive belt tension was a couple points high (14-->16) for a reason I'm clueless on and decided to leave as is.

There's some minor blade drift mid-board yet the boards are mostly clear, minimal knots.

These 1" boards were from wide cants which split at the pith after cutting, so I edged them down to quarter sawn pieces.

I suspect that the blade dulls faster than I expect or the blade became damaged w/o me being aware of it. I'd tend to just skip to a new blade but perhaps there's something else to check. The blade was fairly fresh.

   

[Ben Cut-wright]

Close ups photos show sufficient grain deviation at the end of cut to create possible board stress rather than blade drift. 

[TBrown99]

I didn't mention front or back end of the boards because I'm not sure though I expect that by reading the blade chatter lines I might be able to figure this out. However, I hand edged these so I'm not sure I can any longer trust the direction of the lines...

I can provide more photos...

[Ben Cut-wright]

Whether or not those images are at the beginning of the cut or end of cut, they appear to be consecutive passes at one the *end of the boards.